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Last Update: 2016-02-16

For easy testing and experimenting, below you can find a compiled version of Docker Experimental v1.10.0 with native checkpoint and restore functionality (compiled from the cr-defunct branch of @boucher/docker).

Also, a compiled version of CRIU v1.8.1 (compiled from the no-netns branch of @boucher/criu) with support for a new proposed flag to "skip" network namespaces when checkpointing and restoring. And finally, libprotobuf, a dependency.

A few notes about this release:

  • Networking support is working!
  • seccomp is now on by default in Docker, but only supported in CRIU with kernel 4.13 or newer, so you'll likely want to start your containers with the flag --security-opt seccomp:unconfined

Example use:

docker run -d --security-opt seccomp:unconfined busybox /bin/sh -c 'i=0; while true; do echo $i; i=$(expr $i + 1); sleep 1; done'

If you examine the logs at this point, you should see prints of an increasing integer counter.

docker checkpoint <id>

docker restore <id>

Checking the logs again should show that the counter is still increasing. (Waiting a bit between checkpoint and restore can increase your confidence that the process actually stopped for a while)

NOTE: you may need additional dependencies:

$ ldd `which criu`
    linux-vdso.so.1 =>  (0x00007fffc3094000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f8f0d358000)
    libprotobuf-c.so.0 => /usr/lib/x86_64-linux-gnu/libprotobuf-c.so.0 (0x00007f8f0d148000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f8f0cf43000)
    libnl-3.so.200 => /lib/x86_64-linux-gnu/libnl-3.so.200 (0x00007f8f0cd29000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f8f0c964000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f8f0d57e000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f8f0c65d000)
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